Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for rolling thin X70 pipeline steel strip

A thin gauge, steel strip technology, applied in the direction of metal rolling, profile control, etc., can solve the problems of large residual stress difference of steel strip, high heat transfer efficiency of steel strip, unfavorable plate shape, etc., and achieve the effect of simple operation and control

Active Publication Date: 2020-01-10
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD +1
View PDF10 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the heat transfer efficiency of the existing steel strip is high, and the temperature drop difference between the edge and the middle of the steel strip is larger, resulting in a greater difference in the internal residual stress of the steel strip, which is not conducive to maintaining a good shape

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The 8.8mm thick X70 pipeline steel is obtained through molten iron pretreatment, converter smelting, LF heating furnace refining, RH vacuum refining, and continuous casting. Uniform weak cooling mode is adopted, and the billet casting speed is stable at 1.0-1.1m / min. The temperature rise rate of billet reheating is 6-8°C / min, and the furnace time is 241min. Adjust the roughing mill roll gap and vertical roll centering, optimize the roughing hydraulic system pressure, stabilize the roughing rolling load, adopt 5 rolling passes, and the reduction rate of each pass is 22%, 25%, 26%, and 27%. , 31%, the rolling loads of each pass are 27.3MN, 26.2MN, 30.3MN, 26.7MN, 34.1MN (Note: 1MN=10 6 N), use odd-numbered passes to remove phosphorus water, and roll the 230mm billet to 50mm. After flying shearing to remove the inconsistency between the head and the tail, the finish rolling is 7-stand hot continuous rolling, and the reduction rate of each pass is 33%, 30%, 24%, 21%, 16%,...

Embodiment 2

[0049] 11.1mm thick X70 pipeline steel, through molten iron pretreatment, converter smelting, LF heating furnace refining, RH vacuum refining, continuous casting to obtain steel slabs, the continuous casting crystallizer is put into operation with automatic liquid level control, 4mm light pressure, and secondary cooling water The uniform weak cooling mode is adopted, and the billet casting speed is 1.0m / min. The temperature rise rate of billet reheating is 5-6°C / min, and the furnace time is 317min. Adjust the roughing mill roll gap and centering of the vertical rolls, optimize the roughing hydraulic system pressure, stabilize the roughing rolling load, adopt 5 rolling passes, and the reduction rate of each pass is 21%, 22%, 25%, and 28%. , 28%, the rolling loads of each pass are 26.3MN, 27.0MN, 29.8MN, 27.2MN, 30.7MN (Note: 1MN=10 6 N), using odd-numbered passes of dephosphorization water to roll a 230mm billet to 56mm. After flying shearing to remove the position where the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Convexityaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for rolling a thin X70 pipeline steel strip, and belongs to the technical field of hot continuous rolling steel plate and steel strip rolling. The method comprises the following steps: a, manufacturing a steel billet; b, heating the steel billet, and sending the steel billet to a reheating process to be uniformly heated; c, performing dephosphorization treatment,specifically, high-pressure water is adopted to dephosphorize the steel billet; d, performing rough rolling, namely rolling the steel billet into a steel strip through a rough rolling mill; e, performing finish rolling; and f, carrying out laminar flow cooling to prepare a steel strip, cooling the steel strip by adopting water cooling, wherein the proportions of boiling water of an upper header pipe to boiling water of a lower header pipe of laminar flow cooling is 70% and 100%, starting side water spraying or side air spraying to purge accumulated water on the surface of a steel plate, and controlling the temperature of laminar flow cooling water within the range of 29+ / -1 DEG C. According to the method, the wave shape of the steel strip is improved by optimizing the laminar cooling process, and the problems that due to the fact that the heat transfer efficiency of the steel strip is high in the cooling process of existing thin X70 pipeline steel, the temperature drop difference between the edge part and the middle part of the steel strip is larger, and thus the residual stress difference in the steel strip is larger, and a good plate shape is not well maintained are solved.

Description

technical field [0001] The invention relates to a thin-gauge X70 pipeline steel strip rolling method, which belongs to the technical field of hot continuous rolling steel plate and steel strip rolling. Background technique [0002] X70 and above grade pipeline steel generally adopts acicular ferrite structure type, controlled rolling and controlled cooling process adopts low temperature coiling route, laminar cooling water volume is large, cooling speed is fast, coiling temperature is low, coupled with thin gauge steel plate heat transfer The efficiency is high, and it is easy to produce waves, which seriously affects the tube forming and welding. As the cooling progresses, along the width direction, the temperature distribution of the steel strip is uneven. The middle part of the steel strip is one-dimensional heat transfer, and the edge of the steel strip is two-dimensional heat transfer. During the cooling process, the cooling water is continuously flowing on the surface ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B21B1/22B21B37/44B21B37/28
CPCB21B1/22B21B37/28B21B37/44B21B2001/225B21B2201/06
Inventor 熊雪刚张开华叶晓瑜李正荣
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com